Issue Connecting to Slack API with WebClient

I am trying to pull an active list of users for our slack workspace to use in our IT Department. The goal is to have a webapp that we can see everyone in our applications. I get the following error when trying to connect to the API by using the token from the slack bot I had to make:

Python runtime version

python@3.9

OS info

macOS/Linux

Expected result:

To get a list/dictionary of active users

Actual result:

Traceback (most recent call last):
  File "/Users/johnmichaelmizerany/Desktop/UserDashboard/slack.py", line 15, in <module>
    result = client.users_list()
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/slack_sdk/web/client.py", line 2249, in users_list
    return self.api_call("users.list", http_verb="GET", params=kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/slack_sdk/web/base_client.py", line 135, in api_call
    return self._sync_send(api_url=api_url, req_args=req_args)
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/slack_sdk/web/base_client.py", line 171, in _sync_send
    return self._urllib_api_call(
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/slack_sdk/web/base_client.py", line 284, in _urllib_api_call
    response = self._perform_urllib_http_request(url=url, args=request_args)
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/slack_sdk/web/base_client.py", line 437, in _perform_urllib_http_request
    raise err
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/slack_sdk/web/base_client.py", line 411, in _perform_urllib_http_request
    resp = urlopen(  # skipcq: BAN-B310
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/urllib/request.py", line 214, in urlopen
    return opener.open(url, data, timeout)
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/urllib/request.py", line 517, in open
    response = self._open(req, data)
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/urllib/request.py", line 534, in _open
    result = self._call_chain(self.handle_open, protocol, protocol +
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/urllib/request.py", line 494, in _call_chain
    result = func(*args)
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/urllib/request.py", line 1389, in https_open
    return self.do_open(http.client.HTTPSConnection, req,
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/urllib/request.py", line 1349, in do_open
    raise URLError(err)
urllib.error.URLError: <urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1129)>

[seratch]

@jmmiz I’m not 100% sure if this helps you out but what happens if you run the following script after pip install -U slack-sdk certifi?

# pip install -U slack-sdk certifi
import certifi, logging, os, ssl
from slack_sdk import WebClient

logging.basicConfig(level=logging.DEBUG)
ssl_context = ssl.create_default_context(cafile=certifi.where())
client = WebClient(ssl=ssl_context)
client.api_test()

[jmmiz]

Yes! Thank you for your help @seratch